Resistance device



H. C. NAGEL.

RESISTANCE DEVICE.

APPLICATION HLED MAY 14, 1915.

1,378,126. Patented May 17,1921.

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HARRY c. NAGEL, or wlmrrnsnune, PENNSYLVANIA, ASIGNOR 'ro WESTINGHOUSE ELECTRIC AND MANUFACT RING. ooMrANxn CORPORATION or PENNSYLVANIA.

' RESISTANCE DEVICE.

Application filed May 14, 1915. Serial No. 28,042.

T 0 all w 7mm it may concern:

Be it known that I HARRY C. NAen-L, a

citizen of the United states, and a resident of lVilkinsburg, in the countyof Allegheny and State of Pennsylvania,have invented a new and useful Improvement in Resistance Devices, of which the following is a specification.

My invention relates to electrical resistance devices, and it has special reference to resistance devices of the type in which a number of sections of resistance material are connected together to give a selected amount of resistance.

The'object of my invention is to provide a sectional resistance device constructed of resistance wire which may be continuously wound into a series of integral compact sections.

One embodiment of my invention is shown in the accompanying drawing, in which Figure 1 is a side view, partially in elevation and partially in section,,of a resistance device composed of a number of parallel sections, and Fig. 2 is a side elevational view, with parts in section, showing one of the Sections composing the device shown in Fig. 1, mounted upon a suitable support.

As shown in the drawing, the resistance device is formed by bending a wire 1 of suitable resistance material into a series of loops 2, the loops being arranged to radiate from a common center and preferably to lie in a single plane. This form of. compactly disposing a considerable length of wire in a small space provides'for free access of air to substantially all parts of the resistance element, thereby causing it to be well ventilated. The loops composing each section are preferably arranged to form a circle, as shown in Fig.2, but they may also be so disposed as to give the completed device a rectangular or other desired contour.

Any desired number of units, constructed in the manner just described, may be placed side-by-side upon a suitable support of any desired form. As shown, this support preferably consists of a tube 3, having an insulating coating 4, which should be of suitable size to extend through the central opening provided in each of the resistance units. The adjacent sections upon the tubular support are separated by means of insulating Washers 5, each of which may be provided with a series of radial projections 6 that fit Specification of Letters irritant. Patented lvIay 17,1921.

between the loops'2 of the resistance units and hold the'loopsarigldly in position. The V of nuts on the ends of the central supports.

As shown in the drawing, one end of the tube 3 is connected in any suitable manner to an end plate 7 and the other end of the tube passes. through an opening 8 in a corresponding end plate 9. This end of the tube 3 is threaded to receive a nut 10 which serves to force the end plate 9 against the stack of alternate resistance sections and washers and to compress the several elements together.

It is convenient to form a number of the circular resistance units from one continuous length of wire, a short length of wire being left between each pair-of adjacent sections. This connecting wire may be looped in a plane approximately at right angles to the planes of the units for the purpose of attaching terminals. If desired, theseveral sections may be separately wound and their free ends connected in a series by means of terminal clips, one of which is shown at 11, and the two methods of forming the grids may be combined by winding several sections of a continuous wire and uniting two or more groups of sections by means of a terminal device as shown in Fig. 1.

Instead of single washers of insulating material, such as those shown on the drawing, metallic washers may be used and separated from the resistance wire by means of thin washers of insulating material. 'Many other changes may be made in the structure which I have shown and described without departing from the scope of my invention, and it is-therefore to be understood that no limitations are to be imposed upon my invention except such as are indicated in the appended claims.

I claim as my invention:

1. A two-part electrical resistance device, each part comprising a continuous length of resistance wire composed of a plurality of integrally connected parallel, fiat sections, the connecting portions of said wire being disposed substantially perpendicularly to the planes of said sections, said sections severally comprising a plurality of radial loops symmetrically disposed to form a central opening, said parts being electrically connected by a terminal device.

I 2. An electrical resistance device comprising a series of sections severally composed of a plurality of radially-disposed loops of resistance Wire, spacing and clamping Washers disposed between the saidsections, the said WflSllGlS being provided with projections adapted to fit between the said loops, and means for supporting the said sections and the said spacing Washers.

3. An electrical resistance device comprising a continuous length of resistance Wire composed of a plurality of parallel, fiat sections spaced apart along a single axis, the

connecting portions of said Wire being disposed substantially perpendicularly to the planes of said sections, said sections severally comprising substantially radial loops symmetrically disposed to form a central openingQsaid resistance device being supported upon a central member disposed along said axis Within said openings at right angles to said planes, said sections being separated by a plurality of insulating Washers mounted upon said central member, said ashers being provided With projections extending between said loops.

In testimony whereof, I have hereunto subscribed my name this 80th day of April, 1915. r V

HARRY C. NAGEL. 

